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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-21703 Detail

Description

In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2021/10/26/7 Mailing List  Patch  Third Party Advisory 
https://bugs.php.net/bug.php?id=81026 Exploit  Issue Tracking  Patch  Vendor Advisory 
https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
https://security.gentoo.org/glsa/202209-20 Third Party Advisory 
https://security.netapp.com/advisory/ntap-20211118-0003/ Third Party Advisory 
https://www.debian.org/security/2021/dsa-4992 Third Party Advisory 
https://www.debian.org/security/2021/dsa-4993 Third Party Advisory 
https://www.oracle.com/security-alerts/cpuapr2022.html Patch  Vendor Advisory 
https://www.oracle.com/security-alerts/cpujan2022.html Patch  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write cwe source acceptance level NIST   PHP Group  
CWE-284 Improper Access Control PHP Group  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

20 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-21703
NVD Published Date:
10/25/2021
NVD Last Modified:
11/06/2023
Source:
PHP Group